恶搞程序——黑屏

子窗口回调函数拦截WM_DESTROY消息

主函数中将获取消息、发送消息的过程放入死循环中，并在死循环中不停地给子窗口发送WM_PAINT，重绘整个屏幕

子窗口收到WM_PAINT消息之后将整个屏幕涂黑

本来准备用定时器做的，但是发现并不好使

这个程序一旦运行，我不知道有什么方法来结束它……

最后只能重启虚拟机。。。

恶作剧应该有用吧，嘎嘎

 1 /*------------------------------------------------------------
 2    HELLOWIN.C -- Displays "Hello, Windows 98!" in client area
 3                  (c) Charles Petzold, 1998
 4   ------------------------------------------------------------*/
 5 
 6 #include <windows.h>
 7 
 8 #define ID_TIMER    1
 9 
10 LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
11 
12 int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
13                     PSTR szCmdLine, int iCmdShow)
14 {
15      static TCHAR szAppName[] = TEXT ("HelloWin") ;
16      HWND         hwnd ;
17      MSG          msg ;
18      WNDCLASS     wndclass ;
19 
20      wndclass.style         = CS_HREDRAW | CS_VREDRAW ;
21      wndclass.lpfnWndProc   = WndProc ;
22      wndclass.cbClsExtra    = 0 ;
23      wndclass.cbWndExtra    = 0 ;
24      wndclass.hInstance     = hInstance ;
25      wndclass.hIcon         = LoadIcon (NULL, IDI_APPLICATION) ;
26      wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;
27      wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
28      wndclass.lpszMenuName  = NULL ;
29      wndclass.lpszClassName = szAppName ;
30 
31      if (!RegisterClass (&wndclass))
32      {
33           MessageBox (NULL, TEXT ("This program requires Windows NT!"), 
34                       szAppName, MB_ICONERROR) ;
35           return 0 ;
36      }
37      
38      hwnd = CreateWindow (szAppName,                  // window class name
39                           TEXT ("The Hello Program"), // window caption
40                           WS_OVERLAPPEDWINDOW,        // window style
41                           CW_USEDEFAULT,              // initial x position
42                           CW_USEDEFAULT,              // initial y position
43                           CW_USEDEFAULT,              // initial x size
44                           CW_USEDEFAULT,              // initial y size
45                           NULL,                       // parent window handle
46                           NULL,                       // window menu handle
47                           hInstance,                  // program instance handle
48                           NULL) ;                     // creation parameters
49      
50      ShowWindow (hwnd, iCmdShow) ;
51      UpdateWindow (hwnd) ;
52      
53      while (1)
54      {
55           GetMessage (&msg, NULL, 0, 0);
56           TranslateMessage (&msg) ;
57           DispatchMessage (&msg) ;
58           PostMessage( hwnd, WM_PAINT, 0, 0);
59      }
60      return msg.wParam ;
61 }
62 
63 LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
64 {
65      HDC         hdc ;
66      PAINTSTRUCT ps ;
67      RECT        rect ;
68      HDC        hdcScreen ;
69      
70      switch (message)
71      {
72      case WM_CREATE:
73           //SetTimer (hwnd, ID_TIMER, 1, NULL) ;
74           return 0 ;
75           
76 /*      case WM_TIMER :         
77           InvalidateRect (hwnd, NULL, FALSE) ;
78           return 0 ; */
79      case WM_PAINT:
80           hdc = BeginPaint (hwnd, &ps) ;
81           EndPaint (hwnd, &ps) ;
82 
83           //获取整个屏幕的设备描述表
84           hdcScreen = CreateDC (TEXT ("DISPLAY"), NULL, NULL, NULL) ;
85           rect.left = rect.top = 0;
86           rect.right = GetDeviceCaps (hdcScreen, HORZRES) ;
87           rect.bottom = GetDeviceCaps (hdcScreen, VERTRES) ;
88           FillRect (hdcScreen,  &rect, (HBRUSH)GetStockObject(BLACK_BRUSH)) ;
89           DeleteDC (hdcScreen) ;
90           return 0 ;
91           
92      case WM_DESTROY:
93           //KillTimer (hwnd, ID_TIMER) ;
94           //PostQuitMessage (0) ;
95           return 0 ;
96      }
97      return DefWindowProc (hwnd, message, wParam, lParam) ;
98 }